LEGO Dark Stone Gray Window 1 x 4 x 6 Frame with Three Panes (46523 / 57894)

LEGO Dark Stone Gray Window 1 x 4 x 6 Frame with Three Panes has been used in at least 5 LEGO sets over the past 17 years, since it was first used in 2007. You can also find this part in at least 11 other colors. It has a design ID of 57894 which can usually be found molded into the bottom of the part.